RTD Sensors

Resistance Temperature Device

Resistance Temperature Detectors or resistive thermal devices (RTDs), are temperature sensors that exploit the predictable change in electrical resistance some materials with changing temperature. As they are almost invariably made of platinum, they are often called platinum resistance thermometers (PRTs). They are slowly replacing the use of thermocouples in many industrial applications below 600 °C, due to higher accuracy and repeatability. An RTD is basically a temperature sensitive resistor. It is a positive temperature coefficient device, which means that the resistance increases with temperature. The resistance of the metal increases with the temperature. The resistive property of the metal is called resistivity. The resistive property defines length and cross sectional area required to fabricate an RTD of a given value. The resistance is proportional to length and iversely proportional to the cross sectional area.

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